Squirrel Nest, Intruder Alarm, and Arbor Elf

Prerequisites

• Squirrel Nest on the battlefield
• Intruder Alarm on the battlefield
• Arbor Elf on the battlefield
• Squirrel Nest attached to any Forest you control
• Arbor Elf does not have summoning sickness

Steps

1. Activate the Forest with Squirrel Nest attached by tapping it, creating a 1/1 Squirrel creature token
2. The Squirrel enters the battlefield, triggering Intruder Alarm, untapping all creatures
3. Activate Arbor Elf by tapping it, untapping the Forest
4. Repeat

Results

• Infinite creature tokens
• Infinite ETB
• Infinite mana creatures you control can produce
• Infinite untap of all creatures